Delaunay (crater)

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Delaunay crater 4101 h1.jpg
Coordinates 22°12′S 2°30′E / 22.2°S 2.5°E / -22.2; 2.5Coordinates: 22°12′S 2°30′E / 22.2°S 2.5°E / -22.2; 2.5
Diameter 46 km
Depth 1.9 km
Colongitude 358° at sunrise
Eponym Charles E. Delaunay

Delaunay is a lunar crater. The craters La Caille to the southwest and Faye to the northeast border on the outer rim of Delaunay. Further to the northwest is the prominent Arzachel.

In that location, the sun rises during the third quarter of Earthshine and the sun sets during its first quarter.

This is an irregular crater formation that has an interior ridge running from the northeast side that divides the crater nearly in half, and gives it a heart-shaped appearance. This ridge grows increasingly slender as it approaches the southwest rim, until it terminates at sharp point, giving it the appearance of a curved fang. The outer rim of this crater is equally irregular, and the uneven inner wall varies significantly in width. The southern rim in particular has been heavily damaged by impacts, including La Caille E which intrudes into the interior.

Satellite craters[edit]

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Delaunay.

Delaunay Latitude Longitude Diameter
A 21.9° S 2.0° E 6 km